Adjacent channel optimized receiver
AssigneeUbiquiti Networks, Inc.
InventorsRobert J. PERA, Lance D. LASCARI
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Abstract
The present invention offers significant improvements in the performance of a radio receiver operating in an environment with high desired band interference. The present invention comprises a high selectivity RF circuit that is located between the antenna and the radio receiver, and utilizes superheterodyne technology to filter adjacent channel interference in the desired band frequency spectrum. This type of interference is problematic for IEEE 802.11 radio receivers that are implemented with the popular direct conversion radio receiver architectures. The present invention may be utilized in many types of radio receivers.
Claims19
A device comprising:
- a down-converter operative to receive a first RF signal and generates a second RF signal;
- one or more channel select switches coupled to a plurality of filters, said switches operative to direct the second RF signal to at least one of said filters in response to a control signal, said control signal indicative of an interference signal substantially near the skirts of one of said filters.
A method comprising:
- receiving a radio signal, wherein the radio signal comprises at least a carrier frequency;
- down-converting the radio signal to an intermediate frequency signal;
- determining the presence of an interfering signal;
- selecting a filter in response to said determining, and
- directing the intermediate frequency signal to the filter.
A method comprising:
- receiving a radiated signal, wherein the radio signal comprises at least a carrier frequency;
- down-converting the radio signal to an intermediate frequency signal;
- determining the presence of an interfering signal substantially near the skirts of the carrier frequency;
- selecting a filter in response to said determining;
- directing the intermediate frequency signal to the filter,
- wherein the radio receiver detects the presence of the interfering signal.
Dependencies are inferred from the claim text.